Barometer Basics: Check Your Homework Answers

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The discussion centers on a homework problem related to barometers, where the expected answer is 9600 but the student calculates 15,000. Participants encourage the student to share their calculations to identify errors, emphasizing the importance of understanding the relationship between pressure and liquid height in the tube. They clarify that the problem is more about statics than Boyle's Law, suggesting a focus on pressure equilibrium between the two liquid columns. The conversation highlights the need for a correct application of physical principles to resolve the discrepancy in answers.
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Homework Statement


borometer.jpg


Homework Equations


The given ans is 9600 as attached above, but i get 15 000.

The Attempt at a Solution

 
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stuc said:

Homework Equations


The given ans is 9600 as attached above, but i get 15 000.

The Attempt at a Solution


Show your attempt so we can see where you went wrong.
 
billy_joule said:
Show your attempt so we can see where you went wrong.
Snapshot.jpg
 
Lets approach this from a physical point of view. What should be equal in both cases, and how does that relate to the density?
 
Why do the liquid go up into the tube?
 
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Pressure acting on both liquids is the same
 
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Can you relate the pressure to the height of the column of liquid in the tube?
 
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Then construct the equation pX = pY for the two liquid columns, that is the two columns are created by the same pressure.
 
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Boyle Law>?
 
  • #10
stuc said:
Boyle Law>?
It has nothing to do with Boyle's law. It is actually a simple problem of statics.

andrevdh almost gave you the answer in his replies.
 
  • #11
How do you apply Boyle's Law to a vacuum? :wink:
 
  • #12
Just try the calculation again stuc and show us your results.
 

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